Get the current undo/redo state.
AI agents call get_undo_state to retrieve information from Reaper without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about the undo/redo stack state in REAPER DAW. It performs a read-only query with no capability to modify data, execute commands, or trigger external operations. The blast radius of misuse is minimal—an agent could only learn the current undo state, which has no harmful consequences.
From the tool's definition Tool name 'get_undo_state' and description 'Get the current undo/redo state' indicate a query operation that retrieves state information without modification or side effects.
Documented attack patterns abuse exactly the kind of access get_undo_state gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Reaper, and nothing reaches the server without passing your rules. This is the rule we recommend for get_undo_state:
{
"version": "1",
"default": "deny",
"tools": {
"get_undo_state": {}
}
}get_undo_state is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get the current undo/redo state. It is categorised as a Read tool in the Reaper MCP Server, which means it retrieves data without modifying state.
Register the Reaper MCP server in PolicyLayer and add a rule for get_undo_state: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Reaper. Nothing to install.
get_undo_state is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_undo_state rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for get_undo_state. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
get_undo_state is provided by the Reaper MCP server (twelvetake-studios/reaper-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Reaper, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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158 Reaper tools catalogued and risk-classified — across an index of 43,000+ MCP servers.